</p> 1. The Hyper-X broke the record because
; ^- S% \" M( k9 q8 V) ~ j A it was the first air-breathing jet plane.. g2 @0 F4 N! b) _% U
B it flew along the equator.
: Q, e/ H$ Y& W& J1 \ C it flew at speeds smaller than five times the speed of sound.7 U% n1 z! E5 D: |7 o
D it traveled at a supersonic speed.
9 P! i4 s; f. J7 R7 G- X 2. What kind of an engine did the Hyper-X use?; a3 ~4 l. L1 r) H$ g( s5 g6 l
A A jet engine that gets oxygen from the air.# N- H; y& V7 p3 A. W' |
B A scramjet engine that doesn’t carry its own oxygen supply.
6 K- C5 U) d! z2 i8 |* d$ m C A rocket engine that carries its own supply of oxygen.
! e! J0 n) B/ e( F6 p+ z D A iet engine that uses no oxygen.7 g. B& W' r0 ^# P) z( R" A6 P
3. What is NOT true about the scramjet engine?
8 I" B4 v; Y7 j, }# e( X0 ? A It goes slower than a rocket.8 r" Y% I3 g' A' R0 d* t. t
B It extracts oxygen from the air that flows through the engine.
3 T& b7 J" ]7 r, ?2 D* t C It works only at speeds greater than five times the speed of sound.1 q; A$ r: z9 j) E) e
D It doesn’t carry its own oxygen supply.
M/ |! v" R: h9 U; e 4. What did Werner J.A.Dahm of the University of Michigan say about the Hyper-X test flight?
" s9 I' E, S2 B0 L& G+ Q A It indicated the birth of a very fast airplane.
" t e- A$ y( p" ]6 S B It was self-powered,so it lasted only 11 seconds.# ?1 G7 Q D% n) H. ?' k( c! c
C It can transportcargo quickly and cheaply to the brink of space.% v4 T4 h% H8 l+ F
D It is a major milestone in the journey of making a new type of very fast airplanes,, @! n2 i: c5 O. c5 ^$ [2 M# G" r+ o& L
5. What has NASA planned to do?
+ f- {: V& F7 R! C+ K8 z' H! N6 G A To make another 11-second hypersonic flight at 10 times the speed of the sound.
. m& v0 X0 U/ e. v+ g' }/ f8 ? B To make three more Hyper-X experiments.
7 s! z/ y1 M, h C To retest the aircraft that is left.中华考试网
5 y; K7 n6 M! ]6 G D To make the aircraft fly higher and longer.5 U: r( N$ h2 x) c
【参考答案】CBADA |